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When day and night are equal around the world (North and South Hemisheres) it is called a equinox. In a year that happens twice, once in the Spring which called a Spring Equinox and once in the Fall which is called a Fall or Autumn Equinox. Spring Equinox occurs on March 21 and Fall or Autumn Equinox occurs September 22

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โˆ™ 2011-09-28 03:47:12
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Q: When the day and night are equal length in both hemispheres?
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